What is the square of the signal line for the Beijing Nine Wave flowmeter

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1. The nine wave flowmeter has records but does not display data

If the nine wave flowmeter has records but does not display data, it is usually due to a fault in the sensor signal processing link or display unit, and the signal transmission link and display module power supply need to be checked. 1. Problem diagnosis steps: ① Signal transmission inspection • Check whether the wiring between the sensor and the display instrument is loose or corroded, with a focus on whether the shielding wire grounding is reliable • Use a multimeter to measure the voltage/current value of the signal output terminal: 4-20mA output corresponds to 4mA (0 flow) and 20mA (full range) standards, and pulse output needs to be detected with a frequency meter • If the signal is normal but not displayed, the fault point is in the display unit ② Display unit detection • Confirm the power supply voltage of the display screen (usually 24VDC ± 10%), and if it is lower than 21V, it may trigger undervoltage protection • Check whether the mainboard fuse (usually 0.5A-1A) is blown • Try to restore the factory settings: simultaneously press and hold the "SET"+">" keys for 10 seconds (specific combination needs to refer to the model manual). 2. The sentence is: Common causes of malfunctions • Sensor probe scaling leading to signal attenuation (commonly seen in sewage measurement) • Main board AD conversion module damaged base combustion dust (requiring factory repair) • Display backlight malfunction (weak data visible under strong light oblique view) • Parameter setting error (such as range set to 0) 3 Emergency response plan • Activate the backup recorder interface (RS485/MODBUS) to export data • Short circuit signal input terminal analog signal

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3. What are the commonly used flowmeters in chemical industry sites?

According to the widespread application of flow meters (in the market, cost-effectiveness is generally considered), the mainstream flow meters include the following:

1. Vortex flow meter: the most widely used, accurate, sensitive, and inexpensive, especially for steam flow. In recent years, the integrated vortex flow meter with voltage stabilization and compensation has almost become dominant, but its disadvantage is that it is not shock resistant;

2、 Electromagnetic flowmeter: used for conductive liquid materials and widely used in factories. It is corrosion-resistant, accurate, sensitive, and has a low failure rate. The disadvantage is that the price is still relatively high, especially for imported brands, which can easily cost over 10000 yuan;

3、 Spiral vortex flowmeter: Similar in appearance to vortex street, but with a different measurement principle. On a small diameter, it has a wide measurement range, better sensitivity than vortex street, weak seismic resistance, and cannot measure dirty media;

3、 Turbine flowmeter: For liquid turbines, the diameter can be made very small, sensitive, and inexpensive. The disadvantage is that the material must be very clean and tidy, and impurities can easily get stuck. It is best to add

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